Sometimes the radiators in your heating system will be plagued by trapped air inside, that can find its way into a system after maintenance or even a new radiator fit. This causes the radiator or radiators to remain cold in various parts as the hot water cannot pass the air inside. To get rid of the air you need to bleed it away. A Brixton Plumber is always a call away and can carry out such work if you are unsure, and will ensure the work is done correctly.Process:1). Isolate the central heating pump. This can be done by shutting the spindle operated isolating valves on each side of the pump. You can isolate the boiler, however it is not really required. 2). Identify the bleed valve on the radiator. You should find it on one of its top corners, it a square nut in the centre of the round blanking plug. You need the right bleed key to fit the shank. Professional installers such as Brixton Plumbers have these. 3). Using the key turn the nut anticlockwise for a 1/4 turn. You should not need any more, but, do have a vessel handy to catch any water, in case you open it too far. Note: There is no need to open this valve completely. 4). The air will give a hissing sound as it is released. Keeping the key bleed on the shank, wait until the hissing stops and water appears, then, close the valve tightly.5). Should no water or air be seen or heard when you bleed the radiator, you need to check the feed and expansion tank in the loft. If full of water, then the radiator valve itself could have a blockage. 6). Close the inlet and outlet valve on both ends of the radiator. Remove the screw from the middle of the bleed valve. Use some thin wire to clear the hole, now, re-open one of the radiator valves slowly and eject some water. Close the radiator valve and relocate the screw back in the bleed valve. Open both radiator valves and retry.
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